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Patentcl Mar. 8, 1932 Louis 2. W EBERT, F wA'rEaBUnY,

cofin'ncrxccr, ASSIGNOR 'ro COMPANY, OF- WATERIBURY, CONNECTICUT, ACORPORATION OF CONNECTICUT corrna-srmcon-zmc-Amnumom ALLOYS No Drawing.

This invention relates to alloys-of copper and silicon. containingadditions of zinc and aluminum.

no zinc.

The chief object of this invention is to provide a series of alloyscomposed mainly ofv copper and silicon and containing additions of zincand aluminum to .produce sound,.

strong alloys which are,.highly resistant to the chemical action ofcertain mineral acids, organic acids and other corrosive liquids.

- For the pasti30 years or more the so-called silicon bronzescontainingfrom 3.0 to 5.0 percent silicon and copper have been known as strong andnoncorrosive alloys.

I have discovered that the addition of zinc to copper-silicon alloysbrings about a three fold improvement namely-(1) When thecopper-silicon-zinc alloys areremelted such alloys have a less tendencyto absorb furnace gases than copper silicon. alloys containing L Soundercastings are produce when zinc is present. (2) The corrosion resistanceto certain liquids is improved. For

A test made on coppersilicon alloys containing about 3.0 percent siliconand from 4rto 6 percent zinc showeda loss of from .048 to .055 gram persquare inch in 10 percent hydrochloric acid in an alternate immersiontest of 96 hours. A copper-silicon alloy of about 3.75 percent silicontested under the same conditions had a loss of .083

, gram per squareinch.

\ tensile strength, after a and drawing, ranging (3) The allows arestronger when addit ions of zinc are made. For example: An alloycontaining 97 percent copper and 3.0- percent silicon will have a 43percent reduction in cold rolling from 105,000 to 110,000. pounds persquare inch with an elongation in two inches close to 14.0 percent.containing close to 3.0 percent silicon and zinc from 4 to 6 percentwill have a tensile strength ranging from 115,000 to 130,000

pounds per square inch and an elongation in 1 two inches in theneighborhood of 12 percent,

after the metal hadreceived the same 43%;

percent reduction in cold rolling and drawing.

In order to increase the corrosion resist- Application filed January 15,1930. Serial. No. 421,072.

from 97.0 to 95.0 percent" Copper-siliconzinc alloys ance to certaincorrosive liquids and retain a high tensile strength, aluminum may beadded in amounts ranging from about 0.5 to about 5.0 percent to thecopper-silicon-zinc alloys. An alloy containing copper about 91.5 to92.5 percent; s11icon about 3.0 percent; zinc about 4.0 percent .andaluminum about .5 to about 1.5 percent will have a tensile strengthafter a 42.3 percent reduction in cold rolling and drawing, ranging fromabout 115;000 to about 125,000 pounds per square inch.

m AMERICAN BRASS In preparing alloys for hot working, cold rolling ordrawing, alloys containing from about 1.0 percent to about 4.5 percentsilicon are used together with a zinc content of from about 1.0 to about8.0 percent and an aluminum content of about 0.5 to about 5 percent. Thecastings are first heatedfor homogenizing at a temperature ranging from700 to 800 C. for about one hour. They are then removed from the furnaceand hot rolled to the desired shape. -When the alloys are cold workedthey are softened at certain stages by annealing for about 30 minutes toabout one hour at temperatures ranging from about 500 to about 7 00 C.After cold working may be continued.

The alloys may be prepared by melting a given weight of copperundercharcoal an adding to it the required amount of silicon. After thesilicon has dissolved in the copper, the required amount of zinc isintroduced, and then the desired amount of aluminum is added. Some ofthe alloy scrap may be melted with the copper. before adding thesilicon, zinc and aluminum.

1 have discovered that copper-silicon-zincaluminum alloys containingabout 1.0 to 4.5 percent silicon, about 1.0 to 10.0 percent zinc, andabout 1.0 to 6.0 percent aluminum can be such anneals,

easily hot pressed into practically any de- Having thus set forth thenature of my invention, what I claim is:

1. A copper-base alloy containing about 1.0 percent to about 4.5 percentsilicon, about 1.0 percent to about 8.0 percent zinc, about 0.5 percentto about 5.0 percent aluminum, manganese within the limits of about 0.1percent to 1.5 percent, and the balance copper 2. A copper-base alloycontaining about 1.0 percent to about 4.5 percent silicon, about 1.0percent to about 10 percent zinc,.about 1.0 percent to about 6.0 percentaluminum, manganese about 0.1 percent to about 1.5 percent and thebalance copper. I y

In testimony whereof I aifix my signature.

LOUIS P. WEBERT.

